Usenet crawler used to be my go to, but with them down at the moment (apparently they're working to get back online) I picked up a couple extra indexers just to be certain everything is covered.

I'm using:
altHUB (paid indexer - but only paid $5 for lifetime - sale on at the moment)
nzbfinder (paid indexer - forget how much but it was reasonable for a yearly sub - I messaged them when their regex was broken and they fixed it with in a day or so.)
6box (free, can donate - as up to date as the other two)

I've been on a few sites that are useless for comics. Only one I can remember tho is:
newztown - (paid indexer with some free time and can earn full access) I commented in the forums over a year ago about their regex not being up to date and the mod said he told the devs, but they still haven't fixed it. I pointed it out a couple more times just to see if they would get it going. but nothing as of a week ago.

so ya, interested in what others are using, or if you people think it's a bad Idea to mention them, maybe should delete the thread?

I don't think it's a bad idea to discuss what some of the indexers have in regards to retention - especially when it comes to comics since it's a not often discussed option.

Here's what I know are good/decent for comics:
ALTHub: they always seems to get the comics fast and they have a decent backlog available too
NZBGeek: they have a good backlog of stuff as well as keeping things up to date in regards to the newest stuff from the groups. No issues, good support, fast and usually reliable
6Box: good for the comics.
nzbcrawler: yes'um to the comics.
pfmonkey: again, good for the comics.
dognzb: yups for da goods.
nzbsu: same, although I've heard different stories about the reliability.
miatrix: yups for the comics.

OMGWTFNZBS: not even sure if this is up still, but nope - no comics.
Usenet-Crawler: she's down, and she was free but when she was up - she never had problems getting comics.
Nzbs.org: nodda comics.